JPH115672A - Detecting method of vacancy in bobbin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To get rid of a waste of resources by accurately detecting a moment when a bobbin becomes emptied. SOLUTION: This detecting method of a vacant bobbin is composed of installing a pair of guide rollers 4 passing through a center point M between both flanges in an axis of rotation of a bobbin 1, coming into contact with a plane orthogonal with this axis and contacting with each other, and in this constitution, a filament body 3 rolled on the bobbin 1 is delivered by way of a contact point P of these paired guide rollers 4, and a light emitting element and a light receiving element are properly installed in a position where both straight lines AP and BP connecting both end points A and B of the base of winding trapezoidal ABCD of the contact point P and the filament body 3 onto a barrel part of the bobbin 1 and both emitting and receiving straight lines 5 are crossed each other, and this detecting method detects the bobbin 1 is an vacant one at a time when the filament body 3 cuts halfway the light emitting and receiving straight lines 5 and thereby a sudden variation of light receiving energy comes forward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of detecting an empty state of a bobbin, and more particularly, to a method of detecting an empty state of a bobbin wound with a filament having a relatively high light transmittance from the side such as an optical fiber. The present invention relates to a method for detecting an empty state of a bobbin for detecting that the bobbin has become empty.

[0002]

2. Description of the Related Art As shown in FIG. 2, a thin reflecting plate 101 such as an aluminum sheet is adhered to the surface of the body of a bobbin 1.
Both elements are installed so that the detection light from the light emitting element 102 is reflected by the light and reaches the light receiving element 103 to operate. Alternatively, the light emitting / receiving element 104 in which both elements are integrated is installed at a suitable position. Striatal body 3 wound on bobbin 1
This is a mechanism that can detect this when there is no more.

[0003]

However, when the remaining amount of the striated body becomes small, light may pass through the gap between the striated bodies and cause a malfunction. This malfunction is even more frequent in the case of a striated body whose outer coating is transparent, for example, an optical fiber core or a taped core obtained by tape-forming the same, so that a considerable amount of wire is used. A bobbin replacement process was performed with the strip remaining on the bobbin, resulting in a disadvantage that the strip was extremely wasteful.

[0004]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problem, and the invention according to the first aspect of the present invention is to solve the above problem by setting a center point between both flanges on a rotation axis of a bobbin. A pair of guide rollers which are in contact with a plane which is perpendicular to the axis and which are in contact with each other, and a linear body wound around the bobbin is fed out through a contact point of the guide roller, and the contact point and the body of the bobbin are fed out. An appropriate light emitting element and a light receiving element are provided at a position where a straight line connecting each end point of the bottom of the trapezoidal ABCD and a light emitting and receiving straight line intersect with each other. An empty bobbin detecting method, wherein the bobbin is detected as an empty bobbin when a sudden change in received light energy occurs by cutting the light receiving straight line halfway.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. In the case of the present invention, a special guide device is used when the striated body 3 is first extended from the bobbin 1. That is, the bobbin 1 is fed through a contact point P of a pair of guide rollers 4 which passes through a center point M between both flanges of the rotation axis of the bobbin 1 and is in contact with a plane perpendicular to this axis and in contact with each other.

[0006] Another condition of the feeding is that the traverse width is wound smaller on the body of the bobbin 1 such that the striated body 3 goes up to the upper winding layer so as to form a trapezoid ABCD. .

[0007] Straight lines AP and BP respectively connecting end points A and B on the flange of the first layer in contact with the trunk of the trapezoid ABCD and the contact point P
Note that this is the feeding path that the striated body 3 takes when the striated body 3 of the bobbin 1 is empty. In the present invention, a light projecting element and a light receiving element (not shown in FIG. 1) are provided to arrange the light projecting / receiving straight line 5 so as to intersect these straight lines AP and BP.

It is desirable that the intersection of the light projecting / receiving straight line 5 and the straight lines AP and BP be orthogonal. Therefore, the light emitting and receiving elements which do not appear in FIG. 1 take positions on a straight line perpendicular to the plane of FIG. The installation may be performed on either one of the straight line of the AP and the BP. However, the installation is performed on both of them to increase reliability.

The actual state of feeding when the apparatus of the present invention is used is as follows. That is, immediately after the start of use of the bobbin 1, the feeding start point Q gradually moves to the winding layer closer to the trunk portion while traversing along the upper side CD of the trapezoid as exemplified by QP. And bobbin 1
Is empty, the payout line QP coincides with the AP, so that it intersects with the light projecting / receiving straight line 5, and changes such as a sudden decrease in received light energy are observed.

[0010] In addition, there is a concern that when the wire 3 is unreeled from the bobbin 1, wire run-out may occur, which may cause malfunction. However, in the case of a trapezoidal winding, the wire run-out does not go outward. No worries.

[0011]

According to the present invention, the bobbin empty signal is emitted after the striatum wound on the bobbin completely disappears or the error becomes very small even if there is an error. The amount of the remaining striatum is extremely small, and there is an advantage that the waste dose to be rejected can be reduced and waste can be omitted.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an example of an apparatus for carrying out a method of the present invention.

FIG. 2 is a simplified perspective view illustrating a conventional method.

[Explanation of Signs] 1 bobbin 2 flange plate 3 striated body 4 guide roller ABCD winding trapezoid 5 straight light emitting / receiving line 101 reflecting plate 102 light emitting element 103 light receiving element 104 light emitting / receiving element

Claims (1)

[Claims] 1. A pair of guide rollers (4), which are in contact with a plane passing through a center point (M) between two flanges on a rotation axis of the bobbin (1) and orthogonal to the axis and mutually contacting each other, are provided. The wire body (3) wound around (1) is fed out through the contact point (P) of the guide roller (4), and the wire on the body of the contact point (P) and the bobbin (1) is drawn out. Appropriate light-emitting elements and light-receiving elements are located at positions where straight lines (AP, BP) connecting end points (A, B) of the base of the wound trapezoid ABCD of the body (3) with the light-projecting and receiving straight lines (5) intersect, respectively. And detecting the bobbin (1) as an empty bobbin when the striated body (3) cuts the light emitting / receiving straight line (5) halfway and a sudden change in received light energy appears. Empty bobbin detection method.